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Waste Water Engineering

Waste Water Engineering
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

A heap
None of these
Plateau
Windrow

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Waste Water Engineering
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of

H₂SO₄
HNO₃
HCl
None of these

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Waste Water Engineering
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

100 mg/l
200 mg/l
300 mg/l
400 mg/l

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Waste Water Engineering
At the junction of sewers

None of these
Tops of both the sewers are at the same level
Top of smaller sewer is kept lower
Top of larger sewer is kept lower

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Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Heart disorder
Skin cancer
Lung cancer
Bronchitis

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Waste Water Engineering
The non-clog pump which permits solid matter to pass out with the liquid sewage, is

Pneumatic ejector
None of these
Reciprocating pump
Centrifugal pump

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